2. A solution contains 2.38 g of magnesium
chloride, MgCl,. in 500 cm of solution
(a) Calculate the number of moles of
magnesium chloride in 500 cm of the
solution.
(b) What is the concentration of
(1) magnesium chloride in mol/dm
(II) chloride ions in g/dm3?​

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ